CN1299940A - Method for improving system with circulation fluidizing bed and system thereof - Google Patents
Method for improving system with circulation fluidizing bed and system thereof Download PDFInfo
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- CN1299940A CN1299940A CN00135557.0A CN00135557A CN1299940A CN 1299940 A CN1299940 A CN 1299940A CN 00135557 A CN00135557 A CN 00135557A CN 1299940 A CN1299940 A CN 1299940A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000002485 combustion reaction Methods 0.000 claims abstract description 43
- 239000002245 particle Substances 0.000 claims abstract description 33
- 239000000446 fuel Substances 0.000 claims abstract description 29
- 239000000571 coke Substances 0.000 claims abstract description 19
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- 239000012071 phase Substances 0.000 claims abstract description 14
- 239000007790 solid phase Substances 0.000 claims abstract description 7
- 239000007921 spray Substances 0.000 claims description 40
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 13
- 239000000654 additive Substances 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 239000002912 waste gas Substances 0.000 claims description 9
- 239000008187 granular material Substances 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 230000008676 import Effects 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 230000006872 improvement Effects 0.000 claims description 3
- 238000005979 thermal decomposition reaction Methods 0.000 claims 2
- 238000005507 spraying Methods 0.000 claims 1
- 239000007792 gaseous phase Substances 0.000 abstract 1
- 238000000197 pyrolysis Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 36
- 230000003134 recirculating effect Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 239000002802 bituminous coal Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003077 lignite Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
- F23L9/04—Passages or apertures for delivering secondary air for completing combustion of fuel by discharging the air beyond the fire, i.e. nearer the smoke outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
- F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The method is applicable to a combustion system of the circulating fluidized bed type which system includes a hearth and a cyclone, and operates using fuel that is inserted into the bottom of the hearth, where a reducing atmosphere is created and where the fuel undergoes pyrolysis with separation into two phases, namely a solid phase made up of grains of coke, and a gaseous phase containing volatile matter. Provision is made for a primary air injection, secondary air injections, and a late air injection to be performed at different levels. The late air injected between the top of the hearth and the inlet of the cyclone is used to increase the efficiency with which the cyclone collects the particles that reach the top of the hearth unburnt, and thus to increase the combustion efficiency of the system. The system includes air injection means making it possible to implement the method.
Description
The present invention relates to the method that a kind of improvement has the burning of COMBUSTION IN CIRCULATION FLUIDIZED BED system.It also relates to a kind of system that realizes this method.
The same as is known, especially in ore-fuels and energy station, broken solid fuel, liquid fuel or the gaseous fuel of this system's burning.Its shortcoming is to produce nitrogen oxide (NOx), therefore seeks the discharging that certain methods limits this oxide, especially by impel the nitrogen substance in the fuel be discharged into carry out weak oxide or even the atmosphere of reducing in limit the discharging of this oxide.Realize this restriction by designing such stove traditionally: be configured to make air inlet port Different Plane or " layer " interlock (staggered) on this stove height.
A kind of known solution is to make to be configured to certain flow " initially " air is ejected in the zone that is arranged on the stove bottom, and this flow be determined like this consequently can obtain excess air coefficient, produced reducing atmosphere with this." assist " air to be injected on the one deck or multilayer at place, stove bottom section top, thereby produce oxide regions, and should on the remainder of stove height, extend in the zone.
It's a pity, this known solution can not provide sufficiently high performance, therefore, the objective of the invention is to make the possibility that becomes as described below: have recirculating fluidized bed and in the combustion system of stove that known method relates to and cyclone, reducing the discharging of harmful nitrogen oxide (NOx), and the efficiency of combustion of this system is reduced.
Therefore, the invention provides the method for the burning that a kind of raising carried out in the system of recirculating fluidized bed type, this system comprises stove, and this stove is attended by at least one cyclone, and this stove especially is used for energy is transported in the heat exchanger in the generating equipment.The fuel that this system postulation becomes to use to be inserted on the stove bottom comes work, thereby forming reducing atmosphere and fuel on stove bottom carries out pyrolytic and resolves into two phases: i.e. solid phase and gas phase, and this solid phase is formed by the particle of coke with from the nitrogen-coke of original fuel; This gas phase contains volatile materials, and especially contains the residual nitrogen in original fuel.These particles and volatile materials have stayed imperfect combustion particle simultaneously carrying out the rise of burning fire furnace interior continuously, are drawn and turn back to the bottom of stove by means of these imperfect combustion particles of effect of cyclone.Therefore, the chance that still contains unburned carbon contained another completing combustion of solid particle to these.Spray at least auxiliary air injection that generation weak oxide atmosphere is carried out in the stove that reaches above the bottom section that produces reducing atmosphere except bottom stove, carrying out initial air, also provide " later stage " air to spray.
In the preferred embodiment of the inventive method, the later stage air that sprays in the place, upstream of the inlet port of cyclone is directed to, thereby improve the passage of the solid particle of being drawn by the cyclone effect, thereby increased the collection efficiency of cyclone, and therefore increased the efficiency of combustion of this system.
In the embodiment of the inventive method, spray caused auxiliary immixture by the later stage air, the later stage air of fresh hot-air sprays the burning that is used for improving from the unburned gas in the waste gas of stove.
In an embodiment of the present invention, the later stage air mass flow that ejects in the place, upstream of cyclone inlet is selected to about 5% about 30% the scope to described total air mass flow that is transported to total air mass flow that this system burns that is arranged in.
In the embodiment of the inventive method, initial air is sprayed, auxiliary air sprays and the later stage air to spray be such: they have caused air excess factor, and these coefficient lambda are respectively: the stove bottom in atmosphere is this district of reducing atmosphere is located to be approximately 0.5; The place, top that is weak oxide atmosphere in atmosphere, is positioned at the stove above the above-mentioned part is 0.95 to 1.15 scope; Spray to produce in the later stage it effect be positioned at place, described top above be 1.15 to 1.3.Therefore the obvious minimizing that realizes nitrogen oxide (NOx) discharging is possible.
The present invention also provides the combustion system of circulating fluidized bed type, and this combustion system makes and realizes that said method becomes possibility.
This system comprises stove, relevant with this stove have a cyclone at least, this stove especially is used for energy is transported in the heat exchanger in the generating equipment, and it uses the fuel that is inserted into place, stove bottom to carry out work, and this place, stove bottom, thereby having produced reducing atmosphere and fuel carries out pyrolytic and is separated into two phases: i.e. solid phase and liquid phase, and this solid phase is made up of the particle of coke, and this coke granule contains nitrogen-coke part and from original fuel; This gas phase contains volatile materials, and especially contain the residual nitrogen that is contained in the original fuel, these particles and volatile materials are carrying out the rise of burning fire furnace interior continuously, stayed imperfect combustion particle simultaneously, by means of cyclone, the particle that these are imperfect combustion is absorbed and turns back to the bottom of stove.
According to feature of the present invention, combustion system comprises: be used for realizing the device that " later stage " air sprays, thereby spray hot-air " later stage ", fresh, this device is arranged between the inlet of the top of stove and cyclone, and these devices are configured in the passage that acts on absorbing particles, thereby increase the collection efficiency of cyclone; Be used for realizing initial air is ejected into device in the bottom of stove, thereby produce reducing atmosphere; And be used for realizing the device that auxiliary air sprays, thereby the stove zone above the bottom section that is positioned at the generation reducing atmosphere produces weak oxide atmosphere.
In the present invention, the later stage air jet system comprises: injector, and these injectors lead in the conduit, and by conduit, the top of stove is connected to the inlet of cyclone; Injector, these injectors lead in the described conduit by the spray orifice that is arranged on the pipe inner wall; And selectable injector, lead to conduit through these injectors of its top by being arranged on supravasal spray orifice.
In alternate embodiment of the present invention, combustion system comprises the later stage air ejector, and by the loop of carrying auxiliary air for this system, these later stage air ejectors are supplied to the fresh hot-air from the air heater of system.
In another alternate embodiment, the additive injector is arranged in the later stage air ejector spray orifice, thereby penetrates conduit by described spray orifice, and helps additive to pass most of waste gas, and additive is ejected in this waste gas.
With reference to given the following describes of accompanying drawing in the following catalogue, the present invention and feature and advantage thereof have been described in further detail.
Fig. 1 is the sketch that expression has the COMBUSTION IN CIRCULATION FLUIDIZED BED system, and this system makes the mode with heat be transported to energy becomes possibility in the heat exchanger;
Fig. 2 is illustrated in the figure that how excess air coefficient changes in traditional recirculating fluidized bed combustion system, as Fig. 3 is schematically shown;
Fig. 4 is illustrated in the figure that how excess air coefficient changes in the recirculating fluidized bed combustion system of the present invention, as Fig. 5 is schematically shown; And
Fig. 6 and 7 each side view and views of looking along direction F naturally show the later stage air injection structure of combustion system of the present invention.
The known example of the combustion system 1 of recirculating fluidized bed class is shown schematically among Fig. 1.In this example, this system is designed to fuel such as the coal or the brown coal of calcined ore raw material.For example, it is associated with heat exchanger 2, and this interchanger is transported to the energy of form of heat in the industrial equipment that is used for generating electricity.Stove 3 and cyclone 4 have constituted the main element of combustion system.They are connected with each other in known manner and couple together with heat exchanger, and in this example, they are transported to heat energy in the heat exchanger 2.
The waste gas that has dust granules (this dust granules contains unburned carbon) carries out centrifugal in cyclone 4.The particle of separating by this way is ejected on the bottom of stove 3 again by siphon pipe 6.Initial air is ejected into the bottommost of stove 3 from the bottom, the same shown in arrow A P.Reducing atmosphere often is created in this place, bottom of this stove, and at this place, bottom, air excess factor is significantly less than 1, and as shown in fig. 2, and Fig. 2 has represented how to change along this coefficient lambda on the whole height of the combustion system that is schematically shown out among Fig. 3.In this zone, fuel carries out pyrolytic, and combustible material resolves into two kinds of phases.Therefore, one of these two kinds of phases is that coke granule and sub-fraction are formed from the nitrogen in the original fuel, and this is commonly referred to " nitrogen-coke ".Another is volatile materials mutually and especially combines together from the residue of the nitrogen of original fuel.The same as is well known, the volatile matter content of fuel is high more, and the volatile nitrogen of this part is many more so.Therefore, with regard to regard to the fuel that coal such as brown coal, ub-bituminous coal or bituminous coal constituted of very easily reaction, the ratio of volatile nitrogen is obviously big than the ratio in nitrogen-coke.
The particle of coke is retained in the reduced zone of the bottom that is positioned at stove, and has found dinitrogen N then in nitrogen-coke combustion products
2The time that coke granule is retained in the reduced zone is the function of each granular size basically.Smallest particles leaves this district very soon with the form of particle, and these particles are made of the ashes of the nitrogen-coke that contains unburned carbon and surplus, and the burning of this ashes will be proceeded at the top of stove 3.After these particles were drawn in the cyclone 4 by the conduit of getting through on the stove top 7, when they were ejected into the bottom of stove through cyclone again by conduit 5, described particle burning got more abundant.
Therefore, the collection efficiency of cyclone should be high as much as possible so that can realizes best recirculation, and this is important.
Thereby volatile materials, especially volatile nitrogen are left the reducing zone very apace and are arrived and to be positioned at top, described reducing zone and by air fed zone gradually, it is represented the same with AS2 that the staggered auxiliary air in Fig. 1,3 and 5 advances AS1.The staggered injection of auxiliary air is proceeded till obviously obtaining oxidizing condition, and these oxidizing conditions cause excessive air coefficient λ, and as shown in fig. 2, this air excess factor generally is positioned at 1.15 to 1.30 scope, as 1.2.Especially when the fuel of easily reaction burns, obviously burning oxidation, in atmosphere has especially caused the generation of nitrogen oxide, the main source of this nitrogen oxide is a volatile nitrogen, and its less important source is the residual nitrogen-coke that is contained in the local unburned coke granule.
The routine techniques that is used for realizing nitrogen discharged initial minimizing is in the less generally excess air of stove 3 " free plate (free board) " part selection, and solid particle circulates in this part.But this technology has its limitation, because it has such shortcoming: especially from carrying out the viewpoint of heat exchange and efficiency of combustion with the formed wall of pipe, the work of the recirculating fluidized bed of stove 3 is had a negative impact.Observe by means of example: the coefficient lambda 2 that the coefficient lambda 1 of overall excess air from 1.25 to 1.30 scopes reduces in 1.15 to 1.20 scopes can cause the significantly discharging of the nitrogen oxide (NOx) of minimizing about 20%.But this minimizing is attended by the unfavorable minimizing of 0.5 o'clock to 1 o'clock efficiency of combustion.
As implied above the same, the invention enables the overall stoichiometric composition of the combustion system of adjusting the above-mentioned type to become possibility, therefore reduced nitrogen oxide (NOx) discharging, as following the explanation.
For this reason, as shown in fig. 5, " later stage " air sprays into that AT is arranged in the conduit 7, and conduit 7 is positioned at the import upstream end of cyclone 4.Compare with existing method, this injection makes that the air in the stove 3 is staggered in a significant more scope.It tends to make it to have the zone of stove 3, makes particle keep the relatively long time in this zone in weak oxide atmosphere.
Figure line among Fig. 4 has been represented a such example: how air excess factor changes on the height of the combustion system that Fig. 5 schematically shows, and in the figure, the later stage sprays into that AT is provided with according to the present invention.Shown in the figure top, equally, can obtain the variable of coefficient lambda.In the example that is proposed, this coefficient has value 1.2 in the later stage air spray to produce its zone of effect, and promptly the value that had of the stove entire top of the traditional combustion system that is schematically shown of the value that it had and Fig. 3 is identical.
Advance in the combustion system of AT being provided with later stage air of the present invention, except be sure oing that later stage air jeting effect is in the zone under the situation shown in the Figure 4 and 5, on whole stove top almost, promptly almost equal on all parts of 1.2 among Fig. 2 in coefficient lambda, coefficient lambda keeps the scope near 0.95 to 1.15.
Realize that with the same shown in 7 the later stage sprays import as Fig. 6, and Fig. 6 and 7 shows each comfortable side view and the view of looking along direction F shown in Figure 6 in, the conduit 7 of the top interconnect of stove 3 to the import of cyclone 4.
The later stage air mass flow that decision is sprayed by inlet port AT, thus on " free plate " part, obtain best air excess factor, and solid particle circulates on this free plate.For example, flow is chosen to be positioned at 5% to 30% scope near the total amount combustion air flow.
The hot-air that the later stage injection air is preferably fresh.For example, its temperature is approximately 200 ℃ to 400 ℃.For example, it can supply with circulation from the auxiliary air of the downstream part of the air heater (not shown) that is arranged in described circulation.Upstream end at one or more cyclone of combustion system sprays this hot-air.It can spray by conventional air injector (not shown), and this conventional air injector leads in the conduit 7 by the spray orifice 8 that Fig. 6 and 7 is schematically shown out.These injectors, especially their spray orifice 8 preferably are arranged to like this: the later stage air sprays and has improved passage, the outer wall of solid particle along these passages towards cyclone moves, therefore before being used for collecting them by cyclone, they have applied power downward vertically.By cyclone 4 or selectively produce this effect by one group of cyclone.Improve the collection efficiency of particle in cyclone of sucking-off stove on the passage that in conduit 7, moves by means of later stage air jet-action.The raising of this collection efficiency has caused the raising of solid-fuelled efficiency of combustion.
In cyclone, from waste gas in the stove (this waste gas has more a spot of residual oxygen composition and has tangible unburned gas (as co) composition arbitrarily) and the strong mixing of generation between the later stage fresh air for the second time, make therefore that the burning that realizes unburned gas becomes possibility at first.
In one embodiment, later stage air injection spray orifice 8 is arranged on the vertical wall of the conduit 7 that constitutes inwall.In this example, they are divided into two rows, and row's later stage air is sprayed spray orifice 8, and to be arranged on the top of the conduit 7 that they pass through also be possible.Preferably select the shape and the layout of various spray orifices 8, so that extend transverse to maximum magnitude by spray orifice 8 formed settings.
In alternate embodiment, at least some later stage air injection spray orifices 8, additive injector (additive injectors) (not shown) is set.For example, when SNCR (SNCR) was provided, these additive injectors can be that the nitrate reduction additive sprays pipe.Help additive with high velocity jet later stage air and penetrate in the large quantity of exhaust gas, additive is injected to be advanced in the large quantity of exhaust gas.
Claims (9)
1. the method for the burning in the system (1) of circulating fluidized bed type, carried out of an improvement, this system comprises stove (3), this stove is attended by at least one cyclone (4), this stove is used for energy is transported in the heat exchanger (2) in the generating equipment especially, and this system uses the fuel that is inserted on the stove bottom to carry out work, thereby forming reducing atmosphere and fuel on stove bottom carries out thermal decomposition and resolves into two phases: i.e. solid phase, and it is formed by the particle of coke with from the nitrogen-coke of original fuel; And gas phase, this gas phase contains volatile materials, and especially contain the residual nitrogen in original fuel, these two kinds are being carried out the rise of burning fire furnace interior continuously, stayed imperfect combustion particle simultaneously, be absorbed and turn back to the bottom of stove by means of these imperfect combustion particles of effect of cyclone, spray (AS1 except carrying out at least auxiliary air that generation oxidizing atmosphere is carried out in initial air injection (AP) and the stove above the bottom section of generation reducing atmosphere in the stove bottom, AS2) outside, described method provides " later stage " air to spray (AT), described method is characterised in that: it takes measures to be, under the later stage air effect that is ejected between the import of stove top and cyclone, the passage of the particle that improvement is absorbed by the cyclone effect, thereby increased the collection efficiency of cyclone, and therefore by burn those still the particle of unburned increase the efficiency of combustion of this system.
2. the method for claim 1 is characterized in that: by its auxiliary immixture that causes, the later stage air of above-mentioned fresh hot-air sprays and is used for improving the burning that is contained in from the unburned gas in the waste gas of stove.
3. method as claimed in claim 1 or 2 is characterized in that: the later stage air mass flow that ejects in the place, upstream of above-mentioned cyclone inlet be selected to be transported to total air mass flow of carrying out combustion in this system about 5% in about 30% scope of described total air mass flow.
4. as the arbitrary described method of claim 1 to 3, it is characterized in that: initial air is sprayed, auxiliary air sprays and the later stage air to spray be such: they have caused air excess factor, these coefficient lambda each naturally: the stove bottom in atmosphere is this district of reducing atmosphere is located to be approximately 0.5; The place, top that is weak oxide atmosphere in atmosphere, is positioned at the stove above the above-mentioned part is 0.95 to 1.15 scope; Spraying place, described top of surpassing of its effect of generation in the later stage is 1.15 to 1.3.
5. the combustion system of a circulating fluidized bed type, this system comprises stove (3), relevant with this stove have a cyclone (4) at least, this stove especially is used for energy is transported in the heat exchanger (2) in the generating equipment, and it uses the fuel that is inserted into place, stove bottom to carry out work, and place, this stove bottom carries out thermal decomposition and is separated into two phases thereby produced reducing atmosphere and fuel: i.e. solid phase, and it is formed by coke granule with from the nitrogen-coke of original fuel; And gas phase, this gas phase contains volatile materials, and especially contain the residual nitrogen in original fuel, these particles and volatile materials are carrying out the rise of burning fire furnace interior continuously, stayed imperfect combustion particle simultaneously, by means of cyclone, the particle that these are imperfect combustion is absorbed and turns back to the bottom of stove, described system is characterised in that it comprises: device, it is used for realizing that " later stage " air sprays (AT), thereby injection " later stage ", fresh hot-air, this device is arranged between the inlet of the top of stove and cyclone, and these devices are configured in the passage that acts on absorbing particles, thereby increase the collection efficiency of cyclone; Device, it is used for realizing entering into the initial air injection (AP) of stove bottom, thereby produces reducing atmosphere; And device, it is used for realizing auxiliary air device (AS1, AS2), thus the stove zone above the bottom section that is positioned at the generation reducing atmosphere produces oxidizing atmosphere.
6. combustion system as claimed in claim 5, it is characterized in that above-mentioned later stage air jet system comprises: injector, these injectors lead in the conduit (7), pass through conduit, the top of stove is connected to the inlet of cyclone, and described injector leads in the described conduit by the spray orifice (8) that is arranged on the pipe inner wall;
7. combustion system as claimed in claim 6 is characterized in that above-mentioned later stage air jet system comprises injector, leads to described conduit through these injectors of its top by being arranged on supravasal spray orifice.
8. as the arbitrary described combustion system of claim 5 to 7, it is characterized in that above-mentioned later stage air ejector is supplied to from the fresh hot-air in the air heater of system by the loop for said system conveying auxiliary air.
9. as the arbitrary described combustion system of claim 5 to 8, it is characterized in that the additive injector is arranged in the later stage air ejector spray orifice, thereby pass conduit by described spray orifice, and help additive and pass most of waste gas, and additive is ejected in this waste gas.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9915743 | 1999-12-14 | ||
| FR9915743A FR2802287B1 (en) | 1999-12-14 | 1999-12-14 | METHOD FOR IMPROVING COMBUSTION IN A CIRCULATING FLUIDIZED BED SYSTEM AND CORRESPONDING SYSTEM |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1299940A true CN1299940A (en) | 2001-06-20 |
| CN1201114C CN1201114C (en) | 2005-05-11 |
Family
ID=9553230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00135557.0A Expired - Fee Related CN1201114C (en) | 1999-12-14 | 2000-12-14 | Method for improving system with circulation fluidizing bed and system thereof |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6431095B2 (en) |
| EP (1) | EP1108953B1 (en) |
| CN (1) | CN1201114C (en) |
| DE (1) | DE60022298T2 (en) |
| ES (1) | ES2245635T3 (en) |
| FR (1) | FR2802287B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105805733A (en) * | 2014-08-29 | 2016-07-27 | 中国科学院工程热物理研究所 | Circulating fluidized bed combustion method and combustion device for reducing nitric oxide emission |
| CN106051749A (en) * | 2016-05-27 | 2016-10-26 | 青岛金田热电有限公司 | Low-nitrogen combustion technique based on circulating fluidized bed boiler |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2871554A1 (en) * | 2004-06-11 | 2005-12-16 | Alstom Technology Ltd | METHOD FOR THE ENERGY CONVERSION OF SOLID FUELS MINIMIZING OXYGEN CONSUMPTION |
| JP5417753B2 (en) * | 2008-07-11 | 2014-02-19 | 株式会社Ｉｈｉ | Circulating fluidized bed gasifier |
| FI122040B (en) * | 2009-11-10 | 2011-07-29 | Foster Wheeler Energia Oy | Process and arrangement for feeding fuel into a boiler with circulating fluidized beds |
| CN102466223B (en) | 2010-10-29 | 2014-08-20 | 中国科学院工程热物理研究所 | Circulating fluidized bed boiler |
| CN110975581B (en) * | 2019-12-12 | 2021-09-21 | 湖南人文科技学院 | Device for improving SNCR (selective non-catalytic reduction) denitration efficiency of circulating fluidized bed boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FI79403C (en) * | 1984-06-01 | 1989-12-11 | Ahlstroem Oy | FOERBRAENNINGSMETOD. |
| FR2587090B1 (en) * | 1985-09-09 | 1987-12-04 | Framatome Sa | CIRCULATING FLUIDIZED BED BOILER |
| FI853615L (en) * | 1985-09-20 | 1987-03-21 | Tampella Oy Ab | FOERFARANDE FOER MINSKNING AV UTSLAEPPEN AV KVAEVE- OCH SVAVELOXIDER VID FOERBRAENNING AV KVAEVE- OCH SVAVELHALTIGT BRAENSLE. |
| JP2637449B2 (en) * | 1988-01-12 | 1997-08-06 | 三菱重工業株式会社 | Fluidized bed combustion method |
| DE4102959A1 (en) * | 1991-02-01 | 1992-08-13 | Metallgesellschaft Ag | METHOD FOR BURNING COAL IN THE CIRCULATING FLUID BED |
| US5237963A (en) * | 1992-05-04 | 1993-08-24 | Foster Wheeler Energy Corporation | System and method for two-stage combustion in a fluidized bed reactor |
| US5325796A (en) * | 1992-05-22 | 1994-07-05 | Foster Wheeler Energy Corporation | Process for decreasing N2 O emissions from a fluidized bed reactor |
| US5465690A (en) * | 1994-04-12 | 1995-11-14 | A. Ahlstrom Corporation | Method of purifying gases containing nitrogen oxides and an apparatus for purifying gases in a steam generation boiler |
| SE9402789L (en) * | 1994-08-19 | 1995-10-02 | Kvaerner Enviropower Ab | Method for two-stage combustion of solid fuels in a circulating fluidized bed |
| DE19622299C2 (en) * | 1996-05-21 | 2000-10-12 | Ver Energiewerke Ag | Method for operating a pressure-charged circulating fluidized bed furnace for generating a workable gas for the gas turbine of a combined cycle power plant |
-
1999
- 1999-12-14 FR FR9915743A patent/FR2802287B1/en not_active Expired - Fee Related
-
2000
- 2000-11-28 DE DE60022298T patent/DE60022298T2/en not_active Expired - Lifetime
- 2000-11-28 ES ES00403322T patent/ES2245635T3/en not_active Expired - Lifetime
- 2000-11-28 EP EP00403322A patent/EP1108953B1/en not_active Expired - Lifetime
- 2000-12-13 US US09/734,682 patent/US6431095B2/en not_active Expired - Lifetime
- 2000-12-14 CN CN00135557.0A patent/CN1201114C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105805733A (en) * | 2014-08-29 | 2016-07-27 | 中国科学院工程热物理研究所 | Circulating fluidized bed combustion method and combustion device for reducing nitric oxide emission |
| CN105805732A (en) * | 2014-08-29 | 2016-07-27 | 中国科学院工程热物理研究所 | Circulating fluidized bed combustion method and combustion device for enhancing heat exchange of hearth heated surface |
| CN105805739A (en) * | 2014-08-29 | 2016-07-27 | 中国科学院工程热物理研究所 | Circulating fluidized bed combustion method for adjusting temperature of superheated steam |
| CN105805739B (en) * | 2014-08-29 | 2019-07-23 | 中国科学院工程热物理研究所 | Adjust the circulating fluidized bed combustion method of superheat steam temperature |
| CN106051749A (en) * | 2016-05-27 | 2016-10-26 | 青岛金田热电有限公司 | Low-nitrogen combustion technique based on circulating fluidized bed boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2802287A1 (en) | 2001-06-15 |
| FR2802287B1 (en) | 2002-01-11 |
| US20010006769A1 (en) | 2001-07-05 |
| EP1108953B1 (en) | 2005-08-31 |
| DE60022298D1 (en) | 2005-10-06 |
| EP1108953A1 (en) | 2001-06-20 |
| ES2245635T3 (en) | 2006-01-16 |
| CN1201114C (en) | 2005-05-11 |
| US6431095B2 (en) | 2002-08-13 |
| DE60022298T2 (en) | 2006-06-22 |
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